I often read 1-3 pages of a thread before posting but sometimes when I feel that I can give my opinion and that would be helpful for others then I don't really go through all previous posts. It's someone's own preference to either go directly with a reply or read others posts before posting a reply.

I believe that in some posts it's highly needed to go through others posts but when you're sure that you can write a valuable reply post then I don't think it's necessary to read previous posts. Let's take this thread as example, I have gone through most of the posts before posting my reply but that thing isn't needed in most other posts.

I don't think that it's needed to send a PM to the campaign manager for such things because they already have a lot of work to do and sending them such PM's isn't needed. Some members in a campaign post more the the needed maximum posts of a campaign and in those cases managers often ignore low quality posts and pay an applicant for the posts which are good in quality.